Also, I am interested in seeing what games you folks have in your Vita collection, and your opinion of them:
My games, with my opinion on them:
-----------------
Full games downloads:
DJ MAX Technika Tune = a good game, but can use a more refined control setup.
DOA 5 Plus = a very competent fighting game, marred by ridiculous DLC scheme/pricing and also... it being incompatible with the Ultimate version sucks. Online is virtually dead, and also that ad-hoc trophy -___-
Dragon's Crown = beautiful game, addicting too, although can be repetitive
Muramasa Rebirth = the same as above, although this one is even more repetitive-prone.
NFS Most Wanted = great sense of speed all around, although the lack of story structure whatsoever brings it down a peg. I missed the sense of progression even a barebone/whacky storyline can provide, like the original Most Wanted.
Rayman Origins = haven't played this much, but it's certainly beautiful-looking.
Soul Sacrifice = also haven't played this much, but I like what I have seen. Definitely the game with the most somber atmosphere in the Vita library, I think, and it can be exhausting.
The Walking Dead = smoother than the console version, though in all honesty in my opinion this is more of an interactive visual novel than a "proper" game. A grand adventure, since as typical for games such as this, replayability is kind of poor.
Touch My Katamari = typical Katamari gameplay: short and quick to end too, and the way they handle DLC is... annoying.
WipEout 2048 = absolutely beautiful game. One of the best looking game in Vita, if not strictly the best. The sense of speed is also great. A great game to show-off your Vita to friends and other people.
-----------------
Full games cart:
Gravity Rush = an adorable and very likable lead, unique world/setting, all unfortunately trapped inside a rather mediocre game all-around. Forced touch controls like sliding are stupid and brings this game down even further.
Persona 4 Golden = has reputation in the minds of many as the best game in Vita, and it deserves it. The amount of time the game requires before it handles you control is maddening though, especially on replays.
AC III Liberation = doesn't fully utilize its gimmick (costume stuff) and Vita can't handle everything the developer of this game throws at it, resulting in annoying stuff like framerate problems.
Disgaea 3: Absence of Justice = haven't played it much yet, though the fact that it doesn't take advantage of the Vita power just like the PS3 version doesn't take advantage of PS3's power is really unfortunate.
-----------------
PSN games:
Thomas Was Alone = ahhh.... a unique experience to be sure, although perhaps of all the things I regret buying in Vita this might be the strongest contender.
Mutant Blobs Attack = a nice game with personality and style. Can be funny at times, and mechanically sound too.
Super Stardust Attack = a nice-looking twin-stick shooter, and perfect to be played at short bursts. At times what happening in the screen can be really overwhelming, but boy do those sparkling colors beautiful or what!
ZEN Pinball 2 = a great looking pinball game, that's for sure. A *definitive* improvement over the 3DS version (goddamn it why did I buy that one, *sigh*) A nice game to play if you have any interest in Pinball.
Guacamelee! = haven't played it much to form a solid opinion over it.
Hotline Miami = a great twitch-based game, though it can be repetitive and at times, infuriating as well

(
-----------------
PS1 games:
Breath of Fire 4 = One of the best games in PS1 in my opinion. Awesome old-school RPG with probably one of the best antagonists in JRPG.
Harvest Moon: Back to Nature = Still reigning king as one of the best Harvest Moon games in the series. Dangerously addictive, it has a charm that is still strong even with just PS1-level graphics. I adore this game so much <3
-----------------
Free PS+ stuff:
Uncharted: Golden Abyss = haven't played it much to give a solid opinion, but the graphics are *really* pretty. Although the gameplay seems by-the-number and I can already foresee the annoyance of motion-controls being forced upon me in my future playthrough.
Machinarium = haven't touched this at all.
Pinball Arcade = uhhhh... the makers claim this as "the most authentic pinball games ever" but even if it's authentic, I don't know if it's actually more fun to play compared to Zen Pinball 2 (I don't think so). Less flashy though, that's for sure.
Knytt Underground = only played it for about 15 minutes, jumping and running all around with no direction at all. Quickly bored and haven't touched it again yet.
Dokuro = haven't touched this at all.
Metal Slug XX = well, it's a Metal Slug game, so it's a fun side-scrolling shooting mayhem. The graphics are kind of underwhelming though, even for a PSP game, but it's a fun game nonetheless.
Gods Eater Burst = kickass opening aside, and a good story, this game can be highly repetitive in that basically you'll be doing the same thing over and over and over again. The music in general is a disappointment too, not what I am expecting at all from Go Shiina after Tales of Legendia :\
-----------------
*phew*
That's a fun thing to type, hahaha.